A 500 g ball swings in a vertical circle at the end of a1.5-m-long string. When the ball is at the bottom of the circle,the tension in the string is 15 N. What is the speed of the ball at that point?

A 500 g ball swings in a vertical circle at the end of a1.5-m-long string. When the ball is at the bottom of the circle,the tension in the string is 15 N.
What is the speed of the ball at that point?
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Layton
Given that
The mass of the ball(m)=500g

The radius of the string is(r)=1.5m
The tension in the string is(T)=15N
The acceleration due to gravity is
The tension in the string when the body is at the bottom is given by
$T=\frac{m{v}^{2}}{r}+mg$
now substitute all the values in the above you get the required answer.